bless your dear loving heart for all you've done and what you are trying to do....darn that shelter for not helping. I would keep trying to get ahold of someone at Pet Connections as they will probably be the best solution for you. I will also give you a link to an 'old link' that gave some info on sources that would help HOWEVER...its old and someone else mentioned they aren't doing this any longer, but its worth a try.
also try your local Vet clinics explain its a stray and ask if its possible that anyone there would at least have a look at it and give a prescription...cause I do think it should have an antibiotic...
will this kitten allow you to hold him? would you be able to clean the wound out with warm water and some diluted peroxide?....I will give you the link, see what you can find out...post back and let us know PLEASE, and best of luck....let us know and maybe we can help with more suggestions..
http://www.medhelp.org/health_pages/Pets/RESOURCES-TO-HELP-PAY-FOR-VET-CARE/show/535?cid=2